921008 has 20 divisors (see below), whose sum is σ = 1947048. Its totient is φ = 418560.

The previous prime is 921007. The next prime is 921013. The reversal of 921008 is 800129.

It is not an unprimeable number, because it can be changed into a prime (921001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2441 + ... + 2792.

2⁹²¹⁰⁰⁸ is an apocalyptic number.

It is an amenable number.

921008 is an abundant number, since it is smaller than the sum of its proper divisors (1026040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921008 is a wasteful number, since it uses less digits than its factorization.

921008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252 (or 5246 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 921008 is about 959.6916171354. The cubic root of 921008 is about 97.2943902924.

The spelling of 921008 in words is "nine hundred twenty-one thousand, eight".